Polyatomic Ions

Mercury(I)

Hg2^2+

Ammonium

NH4^+

Nitrite

NO2^-

sulfite

SO3^2-

sulfate

SO4^2-

hydrogen sulfate (bisulfate)

HSO4^-

hydroxide

OH^-

cyanide

CN^-

phosphate

PO4^3-

hydrogen phosphate

HPO4^2-

dihydrogen phosphate

H2PO4^-

thiocyanate

SCN^- or NCS^-

carbonate

CO3^2-

hydrogen carbonate (bicarbonate)

HCO3^-

hypochlorite

ClO^- or OCl^-

chlorite

ClO2^-

chlorate

ClO3^-

perchlorate

ClO4^-

acetate

C2H3O2^- or CH3COO^-

permanganate

MnO4^-

dichromate

Cr2O7^2-

chromate

CrO4^2-

peroxide

O2^2-

oxalate

C2O4^2-

thiosulfate

S2O3^2-

nitrate

NO3^-